Check to ensure that you have the recommended version of Java installed on your Windows computer and identify any versions that are out of date and should be uninstalled.

Very important for security if you use the browser add-on. Do not forget to tick "Suppress sponsor offers when installing or updating Java" in the Advanced tab before updating-it's at the very bottom:

Information

Oracle Java SE 8 Release Updates

Public updates for Oracle Java SE 8 will remain available for individual, personal use through at least the end of 2020.

Public updates for Oracle Java SE 8 released after January 2019 will not be available for business, commercial or production use without a commercial license.

If you are a CONSUMER using Java for individual, personal use, you will continue to have the same access to Oracle Java SE 8 updates as you do today through at least the end of 2020. In most instances, the Java-based applications you run are licensed separately by a company other than Oracle (for example, games you play on your PC are likely developed by a gaming company). These applications may run on the Java platform and be dependent on Oracle Java SE 8 updates beyond 2020. Accordingly, Oracle recommends you contact your application provider for details on how they plan to continue to provide application support to you.

If you are a DEVELOPER, Oracle recommends you review the roadmap information for Java SE 8 and beyond and take appropriate action depending on the type of application you develop and your distribution model.

If you are acting on behalf of an ENTERPRISE, Oracle recommends you review the roadmap information for Java SE 8 and beyond and begin to assess your ongoing Java support requirements in order to migrate to a later release or obtain a Java SE Subscription, as appropriate, on a timely basis.

If you are an ORACLE CUSTOMER who is licensed to use Java SE as part of another Oracle product, you continue to have access to Oracle Java SE 8 updates beyond 2019 for use with those Oracle products, see this My Oracle Support (MOS) note for more information. Further information is available on these sites:

Missing my GIF avatars:(

On several sites, we have seen reports of popups that look very similar to the one Java used to notify users when the content of a site requires the Java plugin to show the full content.

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But if we follow this particular prompt we get something completely different called “Media Downloader”.

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The downloaded file is called setup.exe and is recognized by a few scanners that detect this file as potentially unwanted adware. (PUP.Optional.Media)
It installs a program called Media Downloader version 1.5.